network – POFTUT

Tagged: network


What Is System Administrator and Duties ?

Information Technology or IT provides a lot of positions for technical personnel. System Administrator is the most popular position or role in the IT except Programmers or Applications Developers. In this tutorial we will try to explain the System Administrator role and its duties. System System is a general term to refer a complete hardware and software which can run applications on. Actually network devices like switch, router can be...


Network Classless Inter Domain Routing (CIDR) Cheat Sheet

Internet and most of the network infrastructures uses IP Protocol. IP protocol uses IP addresses in order to connect different hosts and networks over globe. Classless Inter Domain Routing or CIDR is hierarchical IP addressing scheme used to set IP addresses to the hosts and network. Here we will learn how to calculate IP address, Network Address, Broadcast Address, Network Mask and provide these as cheat sheet. IP address, Network...


How To Configure Linux Wireless From Command Line with wpa_supplicant

wpa_supplicant is used to connect wireless networks. wpa_supplicant.conf  file is used to store related configuration file about the wireless network. Also wireless security policy is configured with this file. Install wpa_supplicant Package In most of cases the wpa_supplicant package is installed by default but we can use following commands in order to install this package. Fedora, RHEL, CentOS

Ubuntu, Debian, Mint, Kali

  Help wpa_supplicant More detailed help information can...


TTL Expired In Transit Error and Solution

TTL is the short code for Time To Live. TTL is located in IP packets where it is used to hold the count of intermediate hops. TTL is value is set by source host. Windows operating system set it to 64 where Linux operating systems set to 128. Every router or intermediate host the packet pass will decrease the TTL value of the IP packet. TTL generally used with different...


How To Monitor Network Traffic and Statistics with ntop Tool?

ntop is network traffic and statistic monitoring tool. ntopprovides similar philosophy to top command. There is also web based gui which makes it elegant to use. ntop packages are provided by popular distributions like Ubuntu, Debian, Mint, Fedora, CentOs, RHEL etc. Install ntop For Debian, Ubuntu, Kali, Mint We can install ntop with apt like below.

Install ntop For Fedora, CentOS, RHEL We can install ntop tool with the...


Linux Multipurpose Relay Socat Command Tutorial with Examples

Linux provides different philosophy and use cases from system point of view. socat is very interesting command which provides us the ability to redirect input and outputs from different type of system resources like network, file, command, socket etc. Install For Debian, Ubuntu, Mint and Kali socat can be install dpkg based distributions like below by using apt command.

Install For Fedora, CentOS, RHEL We can install for Fedora,...


How To Download, Install Packet Tracer Into Windows?

Cisco Provides different level of certifications for its products and general network topics. We have all ready examined CCNA certifications in the following tutorial. What is CCNA or Cisco Certified Network Associate? Cisco certification exams mostly depends on practical experience. So a person who want to get certified needs practical experience. Here is a list of ways to get practical experience. At work Rent remote labs Using GNS3 similator Using...


How To Solve “Dns Server not responding”

DNS is the one of the most importnt protocol for internet and network usage. If DNS woluldn’t be exist you will have to type to your browser in order to access this web site. But some times evenwe have internet connection we may have some access errors related to DNS. In this tutorial we will look different causes and solutions about Dns Server not responding . We have all ready  provided...


What is IP Address (Internet Protocol Address)?

In computer networks we need to give each host or system a unique number and/or name. This is the only way to make communication possible. In other ways there will be a lot of problems like collusion or miss interpretation. Most of the system uses IP addresses to communication over computer or IT networks. In this tutorial we will try to answer the question “What is IP address?” and details...


How To Fix Dns Lookup Failed

Dns is the heart of the internet. Without DNS we can not surf over websites easily. But some times Dns may not work properly. We should troubleshot the problem and solve it. In this tutorial we will look the steps we can take to solve this problem. Flush Dns Cache The first and most useful command to solve Dns problem is flushing the Dns data in the cache. During using...

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